jQuery.extend({  
    createUploadIframe: function (id, uri) {  
        //create frame  
        var frameId = 'jUploadFrame' + id;  
        var iframeHtml = '<iframe id="' + frameId + '" name="' + frameId + '" style="position:absolute; top:-9999px; left:-9999px"';  
        if (window.ActiveXObject) {  
            if (typeof uri == 'boolean') {  
                iframeHtml += ' src="' + 'javascript:false' + '"';  
            } else if (typeof uri == 'string') {  
                iframeHtml += ' src="' + uri + '"';  
            }  
        }  
        iframeHtml += ' />';  
        jQuery(iframeHtml).appendTo(document.body);  
        return jQuery('#' + frameId).get(0);  
    },  
    createUploadForm: function (id, fileElementId, data) {  
        //Create form  
        var formId = 'jUploadForm' + id;  
        var fileId = 'jUploadFile' + id;  
        var form = jQuery('<form  action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>');  
        //Handle files  
        if(typeof(fileElementId)=="string"){  
            fileElementId=[fileElementId];  
        }  
        for(var i in fileElementId) {  
            var oldElement = jQuery('#' + fileElementId[i]);  
            var newElement = jQuery(oldElement).clone();  
            jQuery(oldElement).attr('id', fileId);  
            jQuery(oldElement).before(newElement);  
            jQuery(oldElement).appendTo(form);  
        }  
        //Handle data  
        if (data) {  
            for (var i in data) {  
                jQuery('<textarea name="' + i + '" style="display:none;">'+data[i]+'</textarea>').appendTo(form);  
            }  
        }  
        //Set attributes  
        jQuery(form).css('position', 'absolute');  
        jQuery(form).css('top', '-1200px');  
        jQuery(form).css('left', '-1200px');  
        jQuery(form).appendTo('body');  
        return form;  
    },  
  
    ajaxFileUpload: function (s) {  
        // introduce global settings, allowing the client to modify them for all requests, not only timeout  
        s = jQuery.extend({}, jQuery.ajaxSettings, s);  
        var id = new Date().getTime();  
        var form = jQuery.createUploadForm(id, s.fileElementId, (typeof(s.data) == 'undefined' ? false : s.data));  
        var io = jQuery.createUploadIframe(id, s.secureuri);  
        var frameId = 'jUploadFrame' + id;  
        var formId = 'jUploadForm' + id;  
        // Watch for a new set of requests  
        if (s.global && !jQuery.active++) {  
            jQuery.event.trigger("ajaxStart");  
        }  
        var requestDone = false;  
        // Create the request object  
        var xml = {};  
        if (s.global)  
            jQuery.event.trigger("ajaxSend", [xml, s]);  
        // Wait for a response to come back  
        var uploadCallback = function (isTimeout) {  
            var io = document.getElementById(frameId);  
            try {  
                if (io.contentWindow) {  
                    xml.responseText = io.contentWindow.document.body ? jQuery('<div>').html(io.contentWindow.document.body.innerHTML).text(): null;  
                    xml.responseXML = io.contentWindow.document.XMLDocument ? io.contentWindow.document.XMLDocument : io.contentWindow.document;  
                } else if (io.contentDocument) {  
                    xml.responseText = io.contentWindow.document.body ? jQuery('<div>').html(io.contentWindow.document.body.innerHTML).text(): null;  
                    xml.responseXML = io.contentDocument.document.XMLDocument ? io.contentDocument.document.XMLDocument : io.contentDocument.document;  
                }  
            } catch (e) {  
                jQuery.handleError(s, xml, null, e);  
            }  
            if (xml || isTimeout == "timeout") {  
                requestDone = true;  
                var status;  
                try {  
                    status = isTimeout != "timeout" ? "success" : "error";  
                    // Make sure that the request was successful or notmodified  
                    if (status != "error") {  
                        // process the data (runs the xml through httpData regardless of callback)  
                        var data = jQuery.uploadHttpData(xml, s.dataType);  
                        // If a local callback was specified, fire it and pass it the data  
                        if (s.success)  
                            s.success(data, status);  
                        // Fire the global callback  
                        if (s.global)  
                            jQuery.event.trigger("ajaxSuccess", [xml, s]);  
                    } else  
                        jQuery.handleError(s, xml, status);  
                } catch (e) {  
                    status = "error";  
                    jQuery.handleError(s, xml, status, e);  
                }  
                // The request was completed  
                if (s.global)  
                    jQuery.event.trigger("ajaxComplete", [xml, s]);  
                // Handle the global AJAX counter  
                if (s.global && !--jQuery.active)  
                    jQuery.event.trigger("ajaxStop");  
                // Process result  
                if (s.complete)  
                    s.complete(xml, status);  
                jQuery(io).unbind();  
                setTimeout(function () {  
                    try {  
                        jQuery(io).remove();  
                        jQuery(form).remove();  
                    } catch (e) {  
                        jQuery.handleError(s, xml, null, e);  
                    }  
                }, 100);  
                xml = null;  
            }  
        };  
        // Timeout checker  
        if (s.timeout > 0) {  
            setTimeout(function () {  
                // Check to see if the request is still happening  
                if (!requestDone) uploadCallback("timeout");  
            }, s.timeout);  
        }  
        try {  
            var form = jQuery('#' + formId);  
            jQuery(form).attr('action', s.url);  
            jQuery(form).attr('method', 'POST');  
            jQuery(form).attr('target', frameId);  
            if (form.encoding) {  
                jQuery(form).attr('encoding', 'multipart/form-data');  
            } else {  
                jQuery(form).attr('enctype', 'multipart/form-data');  
            }  
            jQuery(form).submit();  
  
        } catch (e) {  
            jQuery.handleError(s, xml, null, e);  
        }  
        jQuery('#' + frameId).on("load",uploadCallback);  
        return {abort: function () {  
        }};  
  
    },  
    uploadHttpData: function (r, type) {  
        var data = !type;  
        data = type == "xml" || data ? r.responseXML : r.responseText;  
        // If the type is "script", eval it in global context  
        if (type == "script")  
            jQuery.globalEval(data);  
        // Get the JavaScript object, if JSON is used.  
        if (type == "json")  
            eval("data = " + data);  
        // evaluate scripts within html  
        if (type == "html")  
            jQuery("<div>").html(data).find('script').remove();  
        return data;  
    },  
    handleError: function( s, xml, status, e ) {  
        // If a local callback was specified, fire it  
        if ( s.error )  
            s.error( xml, status, e );  
        // Fire the global callback  
        if ( s.global )  
            jQuery.event.trigger( "ajaxError", [xml, s, e] );  
    }  
});  